Method of making composite wooden bodies.



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IUhl'llfi \\'()()l)l'1.\' BODIES. (Run. 'ltlxans. llehuenhorst, Germany.Filed h'ept. J0. 1 10. Serial No. 58:2, l2. 1'0 all whom it may concern:

lle it known that I, Cant. 'ltimrzs, manufacturer, and a subject of the(lrand Duke ot' ()ldenburg, German Empire, and a resident. oftihlenstrasse 4, in the city of Del-i menhorst. Grand Duchy of()ldenbiu'g. and (itlltltlll l'hupire, have invented certain new anduseful Improvements in Methods of; Making Composite Wooden llodies,which the following is a specification. This invention relates toimprovements in; a method of manufacturing spheroidah bodies from upluralitv of superposed wood; veneers. Bodies of this class are inextended use in the manufacture of eoverings fol;- the bodies'ofautomobiles or the boxes of. 'arriages. and the like. and they consistof a plurality of thin superposed wood veneers. in the manufacture ofsuch bodies much difficult) is caused by the double curvatures of thesame which render it. ditlieult to get tight joints between adjacent.veneers.

By my invention a strong. tight and practically invisible joint isproduced which need not be coated with canvas before a pplying thevarnish theret .\s is known in the art. before. varnishing the surfacesa coating is applied thereto. and the said coating is afterward groundwith water. in this operation the coating is ground through at variouspoints. and when u ing canvas as a covering the said canvas imbibes thewater used in grinding. whereby it is partly loosened. The method isalso objcetimiahle.

\ because the materials are not uniformly dri d. and because thematerials are in diff r nt degrees expanded by heat. 'lhereby rack andhollows are produced on the bodies. and the gaps between the adjacent\eiu'crs can be seen through the varnish.

The object f the iiu no\'e|ncnts is to proid a method in which the useof canvas as a oating is dispen ed with. For this puro e the outerveneers are not. so disposed r latively to each other as to abut.against- ":o'li other with their ends. but so as to o\ erlap each other,and the veneers are connet-ted with each other with a water proof 1.:lueand under such pressure, that the overla ping ends of the veneers are inpart pressed into each other. When afterward L'l'llttllllfl the outerparts of the complete body no gaps whatever are visible. Such gaps canbe observed. if at all. only by a light change in the direction of thegrain of the wood. 'l'herefore the varnish can be dire tly applied tothe veneer without using a coating of canvas. and no uneven parts orcracks appear on the joints. The number f the veneers used is ditl'erentaccording to \arious conditions. Good results are obtained with three orfive wood veneers of a thickness of one millimeter each. Where gsnehbodies are made convert the outer ve- :necr must necessarily gap atcertain parts. .-\t such places patch veneers can easilv be used whichare so cut according to the shape of the said portions. that theirmargins underlie the nnirgins of such gaps. By gluing under pressure theparts of the wood .are almost entirely forced intoeach other, iso that agap can not be seen even at such places. The overlapping margins of theveneers must not be tapered. but they must be used in their fullthickness.

For the purpose of explaining the invention more in detail an exampleembodying =-the same has been shown in the accompanying drawing in whichthe same letters of reference have been used in all the views toindicate corresponding parts.

ln said drawingsz-I igure 1 is a perspective view of the corner of thehodv of an automobile which is curved in all directions so as to make acomfortable seat. back and arm support. and Fig. 2 is a sectional topview taken on the line 2-42 of Fig. 1 and Fig. 3 is an enlargedcross-section of the joint of the body shown in Figs. 1 and 2. jReferring more. particularly to Fig. 1 the ihne a.-a. may be supposed tobe located in lthe plane of the drawing. To the portion of ithe veneerindicated by the said line a cen- .tral portion of the carriage hodv isconneetech As shown the body consists of a plurality of wood veneers. Inthe detail view of Ifig. 3 live layers are shown which number gives goodresults. While the inner veneers abut each other with their edges c,

175 SP-43 Z r, and I", the margins of the outer layers e and 1- overlapwith their margin the adjacent layers. Al I l have shown in what mannerthe. margins are. laid above ach other. before gluing the same underpressure, and at e l have sh wn the shape of the overlapping ends afterapplying presisure thereto. liy this pressure. the hard portions of thefibrovnseulnr bundles of one section are embedded within the softportions formed between the eorres mnding hard portions of the otherveneer section and vice versa. in this way a homogeneous mutuallycountersunk structure is formed at the joint of the veneer sections. sothat after the completion of the subsequent grinding and polishingoperations. no gap will show at said joint. while at the same time thestrength of the jointed veneers is considerably increased.

Fig. 1 shows by way of example in what manner the improved method may beused in the manufacture of such bodies. .\s will readily be understood.by having the. body curved in every direction the veneers mustnecessarily be split when forcing the same into a convex form. The line11-41 indicates in a diagrauunatieal way. that the said split portionmust be filled up by means of a plurality of patches. Of course. bygrimling the surface of the joint the said line disappcars. Similarconditions are indicated I at the portion e of the body. But in this Icase the veneer does not form a gap, but as the adjacent portions of theveneer are I curved toward each other, the veneer mustbe split, and themargins must be so arranged as to overlap each other, as is shown. Winthe said figure. Also portions of thisv character are made invisible bythe method;

described. The letter f illustrates an example in which two veneers arejointed tot each other. 5 I claim: i Method of forming a spheroidalwooden body which consists in arranging a plu-t l rality of veneers intosuperposed layers gluing said veneers, abutting the veneers 0ft each ofthe inner layers, overlapping the un-t a reduced edges of the veneers ofthe outer,- layers, and applying pressure to said over-Q lapped edges,said pressure being of such; a strength as to mutually countersink saidjedges into each other whereby the surface; fibers of one of said edgesare forced between the contiguous surface fibersof the; other edge.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

' CARL TONJEs.

Witnesses:

Faunamou Horaammu, Fnanmme Rlnou.

